摘要
文中介绍了一种基于集成运算放大器实现的宽带高增益放大器,本系统创造性地利用两级宽带运放VCA822压控放大,宽带运算放大器OPA690输出,完成了一个通频带50 kHz^40 MHz,增益0~68 dB可调的宽带高增益放大器。放大器噪声小,通频带范围宽,最大放大倍数大,后级加入了开关手动切换的自动增益控制电路模块,自制电源降压模块。系统采用多种方式消除了高增益,高频自激。放大器输入输出阻抗均为50Ω,方便和前后级电路匹配。
This paper describes an approach based on integrated operational amplifier for wideband high gain amplifier, this system creative use two wideband voltage controlled amplifier VCA822, with wideband op amp OPA690, completed a passband 50 kHz^40 MHz, 0~68 db adjustable gain broadband high-gain amplifiers. Amplifier noise, the pass band range, a large maximum magnification level after adding the switching manual switching automatic gain control circuit module power down module is made. System uses a variety of ways to eliminate the high-gain, high-frequency self-excited. Amplifier input and output impedances are 50Ω, convenient and front stage circuit match.
出处
《电子设计工程》
2014年第15期146-148,共3页
Electronic Design Engineering
